Added ability to include collapse operators in bloch redfield tensor generation
Removed un-used "args", updated a few docs strings, added cops to brmesolve.
Forgot to add eket transformation...
Fixed a few pep8 things, added two test functions for c_ops
Added c_ops string, restored args in brmesolve, and simplified c_ops liouvillian generation
Merge pull request #258 from kafischer/brme_tensor_cops

bloch redfield tensor with c_ops